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Commit 872770fd6c taught VACUUM VERBOSE and autovacuum logging to display the total number of pages scanned by VACUUM. This information was also displayed as a percentage of rel_pages in parenthesis, which makes it easy to spot trends over time and across tables. The instrumentation displayed "0 scanned (0.00% of total)" for totally empty tables. Tweak the instrumentation: have it show "0 scanned (100.00% of total)" for empty tables instead. This approach is clearer and more consistent.
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.